Zero-day vulnerability

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Zero-day vulnerability
/ˈzɪərəʊ-deɪ ˌvʌlnərəˈbɪlɪti/ ('.)

A vulnerability in code that hackers find before the software vendor does. Because the vendor is none-the-wiser, there is no patch for the bug, meaning until the vendor (a) twigs that there’s a problem, (b) works out how to fix it and (c) rolls the patch out to its customers, hackers who know about it can have a field-day.